Explanation

The past perfect tense requires "had" plus the past participle of the verb.

The past participle of "be" is "been".

Nothing had been done by them.

Explanation

The structure of the earth is divided into four major components:

1. the crust,
2. the mantle,
3. the outer core,
4. the inner core.

Explanation

15 ÷ 3 = 5

5 + 20 = 25

Explanation

James Simpson, a Scottish doctor, is credited with discovering the anesthetic properties of chloroform in 1847

Explanation

Ubay Bin Qa'ab (R.A) was renowned for his beautiful and precise recitation of the Qur'an among the companions.

The Prophet Muhammad (SAW) himself acknowledged him as one of the best Qaris and instructed others to learn the Qur'an from him.

Explanation

 The energy value of food is most commonly measured in kilocalories (kcal),

Which are also commonly referred to as "Calories". 

Explanation

"Higher Than Hope" is the authorized biography of Nelson Mandela, written by Fatima Meer.

Explanation

 The book by Dr. Maurice Bucaille, The Bible, the Quran, and Science,

In 1976, Bucaille published 

Explanation

 Hazrat Haris was the foster father of Hazrat Muhammad 

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Ḥamzah ibn ʿAbd al-Muṭṭalib was a foster brother, companion, and paternal uncle of the Islamic prophet Muhammad. 

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3 foster mothers of the Holy Prophet

Hazrat Halema Saadia (RA)    

Hazrat Khola  (RA)

Hazrat Suwaiba (RA)

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Along with Abdullah, foster sister(s) Ameena and Sheema of Muhammad (PBUH) embraced Islam

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Explanation

"Fast" is the correct adverb here.

It describes how the professional drives.